T.J. discovers an old treasure map in an outdated history book, leading the Gang on a merry chase across the playground to find the mysterious valuables left behind by the map's writers.
It's book report time and TJ and the gang are in the library. They encounter the mythical library kid. She is the palest of the pale and the nerdiest of the nerds. They decide to educate her on the finer points of having recess fun.
Gus is in charge of showing Yope, a Norwegian transfer student, around the school but begins hiding him from everyone when he realizes Yope doesn't know Gus is actually seen as a loser.
Mikey is about to turn ten years old, and he's scared. So scared, in fact that he reverts to his old childhood fan-dom for Bonky... the kind of show that nobody over the age of five should be into.
Miss Finster sprains her ankle and can't keep up with the kids during recess., T.J. is thrilled, as he knows that he can finally get away with all of his biggest schemes.
Mikey is declared the first-ever poet laureate of Third Street School, and is chosen to recite an original composition at a special ceremony honoring him. Determined to write his best work ever, Mikey turns to Menlo.
Mikey signs the kids up to visit a retirement home on the same day as "Señor Fusion Fest," and the Gang reluctantly agrees to the plan, hoping to leave early to go to the festival.
After a mysterious figure drops an envelope containing a hundred-dollar bill outside of Third Street School, T.J. picks it up and shares the happy news with his friends, who all plot to buy extravagant things with their "fortune''.
When Gus's father finds out that Cornchip Girl's father is his archenemy from high school who works for the Navy, Gus and Cornchip Girl are not allowed to see each other anymore.